I just got this one today. It is a Stevens tip up and may also be called a #35 and or a Stevens offhand or offhand target.
One source I found said the marking on this pistol was used from 1886 to 1916.
Can anyone give me any more info or a source?
Corrected heading since I found out correct model; Model 35 rather than tip-up.
Thanks to everyone for your help.